In both Hamburg and Berlin, a full train consists of multiple trainsets. On Hamburg’s U3, that’s typically two DT5 units coupled together, while in Berlin, up to four A3L92 units can run in succession on lines U1 and U3. So today, we’re taking a closer look at how coupling and uncoupling actually works.
Coupling and Uncoupling the DT5
Since the MEGA update for SubwaySim 1, you’ve already been able to couple and uncouple the DT5—such as in the graffiti scenario where you had to return a tagged train to the depot. (Fun fact: in SubwaySim 2, you no longer drop it off at a station, but directly at Hellbrookstraße Depot, short Bba.)
Coupling is simple: slowly approach the other train and stop just before contact. Then drive forward at about 2–3 km/h—this activates the Scharfenberg coupler, and the units will connect mechanically.
If you take a closer look in SubwaySim 2, you’ll spot a new detail: the electrical contact coupling is now animated and locks into place shortly after the mechanical coupling. You can watch the entire process from the exterior or freeflight camera.
Once the units are coupled, a message appears on the display asking you to confirm the new train configuration. You’ll need to deactivate the current cab, then reactivate it to confirm the new setup — and that’s it! To uncouple, just use the driver’s key, turning it to the left.
How Does It Work in Berlin?
Berlin’s vehicles also use Scharfenberg couplers, so coupling two identical trainsets works similarly to the DT5. The procedure is much the same: stop about a metre before the second unit, then approach at 2–3 km/h.
Coupling usually occurs when a specific train configuration is needed for a service. Uncoupling typically happens when a train is too long for a siding, or when a car needs to be replaced—for instance, due to graffiti or a damaged window.
In emergencies, different vehicle types may be coupled—like coupling an A3L92 with an HK. In such cases, the vehicles are mechanically coupled only, meaning only one of them can brake, so extreme caution and reduced speed are essential.
And How Do I Uncouple It?
While coupling works similarly across all types, uncoupling is where things differ—mainly in how and where it’s done.
Let’s start with the HK. The uncoupling button is located on the side of the driver’s desk. First, you need to open a small flap.
Behind it, you’ll find the button to release both the mechanical and electrical coupling. A single press and the two HK units can once again operate separately.
On the A3L92, there’s no button—instead, you’ll find an uncoupling valve under the left table in the cab. You’ll need to open a panel to access it.
Press the valve by hand for about 3 seconds. Compressed air flows from the supply line into the uncoupling cylinders, which separates the two units. And just like that, they’re ready to continue on their separate journeys.
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About SubwaySim 2
SubwaySim 2 has been announced in August 2024 and is currently in development. In the coming weeks, we’ll be giving you insights into the game, its development process, and the new features. Feel free to share your feedback in the Steam Discussions, join our Discord server, and follow us on Instagram. Be sure to add SubwaySim 2 to your Steam or PlayStation Store wishlist so you don’t miss any updates!
https://store.steampowered.com/app/2707070/SubwaySim_2/
Note: This is a work-in-progress version of the game. All screenshots and videos shown are for preview purposes only and are not representative of the final product. Please feel free to share your feedback in the Steam Discussions if you like what you see or notice any specific issues!